Finding the Third Proportional to 917,760 and 1,290,105

Step by Step Solution

1. Step 1: Write the proportion equation
   917,760 : 1,290,105 = 1,290,105 : x
2. Step 2: Convert to fraction form
   917,760/1,290,105 = 1,290,105/x
3. Step 3: Cross multiply
   917,760x = 1,290,105 × 1,290,105
4. Step 4: Simplify right side
   917,760x = 1,664,370,911,025
5. Step 5: Solve for x
   x = 1,664,370,911,025/917,760
6. Step 6: Final answer
   x = 1,813,514.33